Bill Ackman's Comments Cause Icahn Enterprises Stock to Plummet.

Shares of Carl Icahn's investment firm, Icahn Enterprises LP, fell by as much as 24.7% to $18.03, their lowest in nearly two decades, after Bill Ackman called out the company's high valuation on Twitter. This comes after short-seller Hindenburg Research's scathing attack on the company three weeks ago. Ackman echoed Hindenburg's allegation that IEP was relying on a "Ponzi-like structure" to pay dividends. At least one technical indicator suggests that the selloff in IEP shares is overdone.